package com.springboot.test.springbootcrud.component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
 * @author lzy
 * @version v1.0
 * Create DateTime: 2018/12/18 18:40
 * <p>
 * 检查登陆
 */
public class LoginHandlerInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("loginUser");
        if (user == null) {
            //未登录，返回登陆页面
            request.setAttribute("msg", "未登录用户无权访问，请先登录");
            request.getRequestDispatcher("/index.html").forward(request, response);
            return false;
        } else {
            //已登录
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
